Rewrite some parts around the cpufreq comparison table. I missed these in the last commit when I switched stuff over to cpufrequtils as the default. Also added more examples on how to use cpufrequtils to show its flexibility. Other improvements elsewhere.

bring it a little more up to date. punt outdated Xfree86 references. ibm_acpi is now known as thinkpad_acpi. for xorg.conf, DPMS is no longer a boolean variable, and screen blank settings have been moved to a different section.

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